18 research outputs found
The Effect of PlateletĂą Derived Growth Factor on the Cellular Response of the Periodontium: An Autoradiographic Study on Dogs
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142150/1/jper0429.pd
Hysteretic magnetoresistance and thermal bistability in a magnetic two-dimensional hole system
Colossal negative magnetoresistance and the associated field-induced
insulator-to-metal transition, the most characteristic features of magnetic
semiconductors, are observed in n-type rare earth oxides and chalcogenides,
p-type manganites, n-type and p-type diluted magnetic semiconductors (DMS) as
well as in quantum wells of n-type DMS. Here, we report on magnetostransport
studies of Mn modulation-doped InAs quantum wells, which reveal a magnetic
field driven and bias voltage dependent insulator-to-metal transition with
abrupt and hysteretic changes of resistance over several orders of magnitude.
These phenomena coexist with the quantised Hall effect in high magnetic fields.
We show that the exchange coupling between a hole and the parent Mn acceptor
produces a magnetic anisotropy barrier that shifts the spin relaxation time of
the bound hole to a 100 s range in compressively strained quantum wells. This
bistability of the individual Mn acceptors explains the hysteretic behaviour
while opening prospects for information storing and processing. At high bias
voltage another bistability, caused by the overheating of electrons10, gives
rise to abrupt resistance jumps
The Effect of Platelet-Derived Growth Factor on the Cellular Response of the Periodontium: An Autoradiographic Study on Dogs
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142150/1/jper0429.pd